📝 Add disclaimer to the main repository

DISCLAIMER.md

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+# DISCLAIMER
+
+The Alan Turing Institute and its group companies ("we", "us", the "Turing") make no
+representations, warranties, or guarantees, express or implied, regarding the information contained
+in this repository, including but not limited to information about the use or deployment of the Data
+Safe Haven and/or related materials. We expressly exclude any implied warranties or representations
+whatsoever including without limitation regarding the use of the Data Safe Haven and related
+materials for any particular purpose. The Data Safe Haven and related materials are provided on an
+'as is' and 'as available' basis and you use them at your own cost and risk. To the fullest extent
+permitted by law, the Turing excludes any liability arising from your use of or inability to use
+this repository, any of the information or materials contained on it, and/or the Data Safe Haven.
+Deployments of the Data Safe Haven code and/or related materials depend on their specific
+implementation into different environments and we cannot account for all of these variations. Safe
+use of any Data Safe Haven code or materials also relies upon individuals' and their organisations'
+good and responsible data handling processes and protocols and we make no representations and give
+no guarantees regarding the safety, security or suitability of any instance(s) of the deployment of
+the Data Safe Haven. The Turing assumes no responsibility for updating any of the content in this
+repository; however, the underlying code and related materials may change from time to time with
+updates and it is the user's responsibility to keep abreast of these updates.